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a in (-oo:+oo)
(1/5)*a+5/15 = (1/3)*a // - (1/3)*a
(1/5)*a-((1/3)*a)+5/15 = 0
(1/5)*a+(-1/3)*a+5/15 = 0
1/3-2/15*a = 0 // - 1/3
-2/15*a = -1/3 // : -2/15
a = -1/3/(-2/15)
a = 5/2
a = 5/2
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